Island



(No Model.)

C. D. ROGERS.

MACHINE PoR GRINDING 0R POLISHING THB HEADS 0F SG'RBWS.

N. 253,890. -Patented Feb. 21,1882.

INVENTDFM N. PETERS, Puma-Lichugnplwr. wzmingmn, D. C.

o UNITED ,STA-TES lPATENT OFFICE.

CHARLES D. ROGERS, OF PROVIDENCE, RHODE ISLAND, ASSIGNORIC THE AMERICANSCREW COMPANY, OF SAME PLACE.

MACHINE FOR GRINDlNG R POLISHING THE vHEADSl 0F SCREWS.

SPECIFICATION forming part of Letters Patent No. 253,890,dated February21, 1,8872.

y i Application flied october 12, 1881, (Nomodel.) l

To all whom it'mcty concern:

Beit known that I, GHAnLns D. Revenus, of'

thecity and county of Providence, and State of Rhode Island, haveinvented a new and useful Improvement. in Machines for Grindspring orother suitable jaws for holding the work, which spindle iscapable'ofsome-longitudinal movement in its hearings, and is piv oted sothat it can be moved in the are of a circle in front of the wheel, andis also mounted so that it can be moved radially away from the wheel andswing in the are of a circle into a position to facilitate the insertionand re,- moval ofthe work.

Referring to the drawings, Figure l represents my improved machine inplan. Fig.'2 shows the same inside elevation. Fig. 3 rep resents the bedand spindle in the positions they occupy when thework is to be insertedor removed. Fig. 4 shows, in vertical section, the spindle and the partsin and upon which it is mounted. j

' A is the frame of the machine, upon which the grinding or polishingwheel B is mounted,

so that it may be made to revolve by a belt passing over the pulley b.As shownin Fig. l, the face of the wheel B is provided with one or moreperipherical grooves of a contour adapted to the Work to be operatedupon; but the faceof the wheel may be flat, it' desired.

To the frame A an arm, A', is adjustably .secured, which arm supports astationary plat form, C, adjustably attached thereto.

Upon the platform C the movable bed D and the frame E, which supportsthe spindle F, are mounted in' a manner hereinafter toA be described. Asshown in Fig. 4, the spindleF is hollow, and its inner end is providedwith The spindle F is mounted gitudiually to and from the Wheel B, anditis 1" provided with a pulley, G, splined thereto for giving rotationto the spindle. For the purpose of controlling the longitudinal move- 6oments of the spindle and affording a means by which the'work can bepressed against lthe wheel, a disk or buttomj", is loosely mounted onthe outer end ot' the spindle, which button is intended to be grasped bythe hand'of the 65 operator. For the purpose ot' ejecting the work afterit is finished the spindle is provided with an axial spring punch, g, asshown in Fig. 4.

The spindle-frame E ispivoted to the bed 7o D by a pin, e, so that saidframe can swing in the arc ofa circle on'said bed, in order that allparts of the screw-head may be presented to and be acted upon by thewheel B. The outer faceof the bed D is preferably in the form of the arcofa eircle,and is provided with stops d djto limit the movements ot' thespindleframe. Y V

The longitudinal movement of the spindle F:in the frame E is onlysuflicient to allow the 8o Work to be slightly withdrawn from the wheel,and its movements in the arc of a circle are only such in extent as willsecure thepresentation ot' all parts ofthe convex head of the work tothe wheel B. that some means be employed whereby the inner end of the.spindle F may be sufficiently withdrawn fronithe wheel and the spindlemay occupy such a position with relation tothe It is'necessary,therefore, 85

wheel as that the work can be conveniently in- 9o sorted and removed.For this purpose the bed D, to which the spindle.- frame is pivoted, is

made movable upon the platform C, so that the said bed and the spindlecan be moved radially away from the wheel, in order that the spindle maybe swung into a position parallel, or nearly so, with, the face of thewheel and be sufficiently removed therefrom to allow the work to beconveniently inserted and withdrawn, as shown in Fig. 3.

IOO

The manner in which the bed D is mounted ou the platform C, so that itmay have the movements just described, is as follows: The pin e, whichpivots the spindleframe to the bed D, passes through said bed, and alsopivots it to a slidin g block, H, which is dovetailed into the platformC. At all times the block H is pressed toward the wheel B by a spring,J, located in a groove in the platform C, and bearing against saidplatform and a lip, h, on the block H, as shown in Fig. 4..

As shown in each of the figures, thc bed D is provided with a handle,D', the inner end of which, as shown in dotted lines, is wedgeshaped orrounded to engage with a recess, c, in the outer edge of theplatformwhich edge is the are of a circle-and lock the bed D thereto bythe force of the springvJ; The rounded inner end of the handle D', inconnection with the recess c, forms a stop to limit the inward movementof the bed D and spindle-frame E. By pulling upon the handle D the blockH, the bed D, the frame E, and its spindle may be moved rearward-thatis, radiallyfrom the wheel. The bed D may then be moved in the are of acircle to 'the right or left, the inner end of the handle D engaging theedge of the platform C, and the spindlemay be moved into the positionshown in Fig. 3, in which position the work can be ejected by thespringpunch g, and new work can-be readilyinserted.

The operation of the machine is substantially as follows: The bed Dbeing locked to the platform C in the position shown in Fig..1, thespindle F and wheel B being in revolution, and work being inthe spindle,the operator seizes the button f and presses the work upon the wheel, atthesame time movingthe spindle and its frame from side to side in thearc of a circle until the head of the screw is iinished. The handle Dlis now seized and the bed D, the spindle, and its frame are moved' theedgeof the' platform, and the'spindle is moved to a'position parallel,or nearly so, with the face of the wheel. The springfpunch. g is nowoperated to eject the work, a new screw isinserted, the bed D isreturned to-itsoriginal position, and the operations above described arerepeated.

H From the foregoing descriptionit will be understood that during theoperation of inishin g the work the bed Dand platform C are lockedtogether, are stationary, and are practically one, but that when thework is to be inserted or removed the bed can be unlocked from theplatform, can be moved rearward and in the arc of a circle, therebywithdrawing the work to such a distancevfrom the wheel that the latterwill not interfere with the removal and insertion of the work.

As hereinbefore remarked, the platform C is adjustably mounted onthe armA. This is done in'order that the work may be presented to a new surfaceon the face ot' the wheel when the latter becomes worn, and the arm A isalso adjustable on the frame of thc machine, in order that the work maybe brought up to the wheel as the latter becomes reduced in'size.

What I claim as my invention, and desire to secureby Letters Patent, is

1. The'combination, as before set fortlnof a grinding or polishingwheel, a work holder which -iscapable of revolution andlongitudinalmovement in its bearings, a frame in which* said holderismounted, aslidingblock to'which said frame is pivoted, and a platformadjustable laterally and longitudinally with relation,

to the wheel upon' which said sliding block is mounted,substantially asand for the purposes specified.

2. The combination,` as beforeset forth, of aI grinding or polishingwheel, a work-holder which is capable of revolution and longitudi nalmovementin its bearings,a frame in which said holderisjournal'ed, a bed,D, upon whichI said frame is mounted, a sliding block to which saidframeand bed are pivoted, a platform'for supporting the parts, andsuitablemeans, as

described, for temporarily locking the bed to` the platform,substantiallyas-set forth.

3. The combinatiolnas before set forth, of a grinding or polishingwheel, a'spindle which isV capable ot' revolution and longitudinalmovement in its bearings, suitable jaws attachedito said spindle forholding thework, a frame in which said spindle is journaled, a bed, D,upon whichsaid frame is mounted, a sliding block to whichl said frameands bed are pivoted, a springthepressure of which causesthe' saidyvparts to'movetoward the grinding-wheel, and' a stop to limit the extentot'theirforward move#- ment.

CHARLES D.` ROGERS.

Witnesses:

W. ELTHURsroN, I. KNIGHT.

IOC

